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    <div> 标签名</div>
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<div>
    1234
    <span>hello front</span>
    <span>hello front</span>
    <div>hello div</div>
</div>
<ul>HTML
    <li>span</li>
    <li>div</li>
    <li>a</li>
    <li>
        <ul>
            <li>haha</li>
        </ul>
        <ul>
            <li>
                <ul>
                    <li>hihi</li>
                </ul>
            </li>
            <li>
                <ul>
                    <li>
                        <ul>
                            <li>wowo</li>
                        </ul>
                    </li>
                </ul>
            </li>
        </ul>
    </li>
    <li>...</li>
</ul>
<ul>CSS</ul>
<ul>JAVASCRIPT</ul>

<ol>
    <li>HTML</li>
    <li>CSS</li>
    <li>JavaScript</li>
</ol>

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